MESOSCALE DISCUSSION 0852
   NWS STORM PREDICTION CENTER NORMAN OK
   1255 PM CDT SUN MAY 22 2011
   
   AREAS AFFECTED...NRN AL...NWRN GA...MIDDLE/ERN TN...CNTRL/ERN KY
   
   CONCERNING...SEVERE POTENTIAL...WATCH LIKELY 
   
   VALID 221755Z - 221900Z
   
   THUNDERSTORMS ARE EXPECTED TO INCREASE IN COVERAGE THROUGH THE
   AFTERNOON HOURS ACROSS PORTIONS OF TN VALLEY.  A FEW SEVERE STORMS
   ARE POSSIBLE.  A WW WILL LIKELY BE NEEDED SOON.
   
   LATEST VISIBLE SATELLITE IMAGERY SHOWS AN INCREASING CU FIELD WITH
   ISOLATED THUNDERSTORMS BEGINNING TO DEVELOP ACROSS PORTIONS OF
   MIDDLE TN AND NORTHERN AL.  THIS ACTIVITY IS INTENSIFYING AHEAD OF A
   WEAK MID LEVEL SHORTWAVE TROUGH MOVING ACROSS AR/WEST TN...AND IN
   REGION WHERE SUBSTANTIAL HEATING HAS ALREADY OCCURRED TODAY. 
   DEWPOINTS IN THE MID 60S ARE YIELDING MINIMAL CINH AND MLCAPE VALUES
   APPROACHING 2000 J/KG.  LOW LEVEL WINDS ARE NOT PARTICULARLY STRONG
   IN THIS REGION...BUT FORECAST SOUNDINGS SHOW 35-40 KNOTS OF DEEP
   LAYER EFFECTIVE SHEAR AND RELATIVELY STEEP MID LEVEL LAPSE RATES. 
   THIS SHOULD PROMOTE ORGANIZED MULTICELL OR SUPERCELL STORMS CAPABLE
   OF LARGE HAIL AND DAMAGING WINDS.
   
   ..HART.. 05/22/2011
   
   
   ATTN...WFO...RLX...GSP...MRX...JKL...FFC...ILN...LMK...OHX...
   BMX...HUN...PAH...
   
   LAT...LON   37248706 37928613 38588381 38018267 37028234 35678301
               34928422 34178548 34118708 34268796 35688696 37248706